• 제목/요약/키워드: operations efficiency

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목가구(木家具) 생산관리(生産管理)를 위한 전문가(專門家) 시스템의 기초(基礎) 연구(硏究) (A Fundamental Study on the Expert System for the Operations Management in Wood Furniture Industry)

  • 김일숙;이형우
    • Journal of the Korean Wood Science and Technology
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    • 제21권2호
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    • pp.23-30
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    • 1993
  • As the demand of wood furniture becomes diverse and large-sized, artificial intelligence technique is required to design the expert system which can promote the efficiency of the operations management in wood furniture industry. This study was carried out to develop the expert scheduler, which was applied to the scheduling in chair-manufacturing process to evaluate its validity. The expert scheduler could show the results of scheduling must faster than Gantt chart method with ease. Maximum tardiness in the current chair-manufacturing process could be reduced from 29 seconds to 5 seconds by the addition of a spindle sander, a 12 spindle universal boring machine, and a moulding sander to sanding, boring, and moulding process, respectively.

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재고관리성과가 에너지효율성에 미치는 영향에 대한 실증분석 : 국내 석유화학 기업을 대상으로 (Analyzing the Impact of Inventory Management Performance on the Energy Efficiency in Korean Petrochemical Companies)

  • 김길환;이지웅
    • 경영과학
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    • 제34권3호
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    • pp.1-14
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    • 2017
  • This study empirically analyzes the impact of inventory management performance on the energy efficiency in Korean petrochemical companies. The concept of the distance function is used to define the energy efficiency and the estimation of the distance function is performed using the stochastic frontier analysis. The inventory turnover is selected as the variable indicating the inventory management performance of the company. The main results of this study are as follows. First, the inventory turnover has a positive impact on energy efficiency. Second, during the period over 2011~2015, while the gap in energy efficiency among the companies expanded, the average energy efficiency decreased. Third, the average energy efficiency in upstream process companies was greater than downstream process companies and the gap in energy efficiency among downstream process companies was greater than upstream process companies. Fourth, the average marginal effect of inventory turnover on energy efficiency increased gradually from 2011 to 2015. Finally, the average marginal effect of inventory turnover in downstream process companies was greater than upstream process companies, and the gap in the marginal effect of inventory turnover among downstream process companies was greater than upstream process companies. These results together imply the importance of inventory management in terms of energy efficiency.

Comparative Port Performance Analysis of Italian Ports

  • D'agostini, Enrico;Ryoo, Dong-Keun;Jo, So-Hyun
    • 한국항해항만학회지
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    • 제39권5호
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    • pp.393-399
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    • 2015
  • Recently, the fierce competitions in the shipping industry and the global economic downturn have heavily influenced ports' operational strategies. In order for port authorities to remain competitive at an international level and to provide more accurate information to develop National policies, ports are required to analyse and improve operations' efficiency. In this paper, the efficiency of 19 Italian ports in 2013, handling different types of cargoes, is assessed through the application of Data Envelopment Analysis (DEA), with constant return to scale (CRS) and variable return to scale (VRS). The purpose of this study is to analyze the efficiency of Italian ports and evaluate whether differences in size and specialization of each port (or cargo handled) are directly correlated with ports' efficiency.

벤처기업의 효율성과 재무요인이 기업의 생존에 미치는 영향 분석 (The Analysis of Financial Factors and efficiency that influence on the Venture Business' Survival)

  • 송성환;권성훈;홍순기;유경진;배영임
    • 경영과학
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    • 제27권1호
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    • pp.107-116
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    • 2010
  • There are several stage in corporate's life cycle such as foundation, growth, maturity or bankruptcy. A bankruptcy is very important for corporate in the life cycle. Especially, venture business' life cycle is short compare to other type of corporate. A lot of venture businesses have emerged and bankrupted soon in the market. Venture businesses' survival or bankruptcy have been influenced by not only external environment like the rate of exchange, oil price, and foreign exchange crisis but also internal environment such as efficiency, process, human resources, finance and CEO. In this paper, we attempt to examine financial factors and efficiency that influence on the venture businesses' survival and bankruptcy. The more venture businesses have high efficiency score, the more they have high probability of survival.

The Effect of Unobservable Efforts on Contractual Efficiency: Wholesale Contract vs. Revenue-Sharing Contract

  • Kang, Sungwook;Yang, Hongsuk
    • Management Science and Financial Engineering
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    • 제19권2호
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    • pp.1-11
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    • 2013
  • An interesting puzzle in business practices is that although many researchers emphasize the benefits of a revenue-sharing contract, a wholesale contract has remained to be the most common contractual form. By introducing the concept of unobservable efforts, we examine the contractual efficiency of a wholesale contract and a revenue-sharing contract. The multi-task agency model and experimental design approach are used to analyze the relationship between the contractual efficiency and parameters. A major finding of our study is that a wholesale contract coordinates unobservable efforts, while it fails to coordinate the order quantity decision. Because unobservable efforts have mixed effects on the contractual efficiency, the superiority of contract type depends on parameters. This finding implies that a wholesale contract can be a competitive contract, especially when unobservable efforts are heavily involved. Our conclusion is that the current popularity of a wholesale contract is manager's rational response to complex supply chain environments rather than irrational behaviors.

3-Level T-type Inverter Operation Method Using Level Change

  • Kim, Tae-Hun;Lee, Woo-Cheol
    • Journal of Electrical Engineering and Technology
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    • 제13권1호
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    • pp.263-269
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    • 2018
  • In this study, a selective inverter operation between a 2-level voltage source converter (VSC) and a 3-level T-type VSC (3LT VSC) is proposed to improve the efficiency of a 3LT VSC. The 3LT VSC topology, except for its neutral-point switches, has similar operations as that of the 2-level VSC. If an operation mode is changed according to efficiency, the efficiency can be improved because efficiencies of each methods are depending on current and MI (Modulation Index). The proposed method calculates the power losses of the two topologies and operates as the having lower losses. To calculate the losses, the switching and conduction losses based on the operation mode of each topology were analyzed. The controller determined the operation mode of the 2- or 3-level VSC based on the power loss calculated during every cycle. The validity of the proposed control scheme was investigated through simulation and experiments. The waveform and average efficiency of each method were compared.

An Analysis of Container Port Efficiency in ASEAN

  • Seo, Young-Joon;Ryoo, Dong-Keun;Aye, Myo-Nyein
    • 한국항해항만학회지
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    • 제36권7호
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    • pp.535-544
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    • 2012
  • In order to improve the overall ASEAN maritime transport network, each port's efficiency is regarded as a crucial factor that should be calculated periodically. This study evaluated the relative efficiency of container port operations of 32 ports belonging to 9 ASEAN nations using Data Envelopment Analysis (DEA). It found that 2 out of 32 ports in 2010 were measured as efficient ports. This study yielded two major findings. Firstly, the ports assessed as inefficient need to benchmark similar ports in size and structure from the ports that are assessed as efficient to improve their efficiency. Secondly, these results could be used to determine potential candidates and country for an international port development co-operation programme with Korea to improve the performance of the entire ASEAN port network by developing the infrastructures of ill-equipped ports.

제조 업종의 ERP 도입 전후에 대한 DEA 상대적 효율성 비교 평가 (A Study on Efficient Evaluation for Before and After of ERP Implementation using DEA in Manufacturing Industry)

  • 함용석;김태영;박창순
    • Journal of Information Technology Applications and Management
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    • 제20권3_spc호
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    • pp.169-185
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    • 2013
  • In this research, for find out how operations efficiency for ERP systems, after introducing ERP to manufacturing firms with DEA technique. According to research analyzed relative time dependent efficiency, using Time Window Analysis. And for company group and the other firm within the each same Industry, the relative effectiveness of each company group establishment was compared using DEA.

PCB 변압기 및 인덕터를 이용한 ZVA Forward DC-DC 컨버터 (ZCS Forward DC-DC Converter using PCB Transformer and Inductor)

  • 안태영
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2000년도 전력전자학술대회 논문집
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    • pp.159-162
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    • 2000
  • In his paper the principle of using coreless printed circuit board (PCB) based transformer in 2.3MHz, 12W class ZVS Forward DC-DC converter has been successfully demonstrated. With no core loss coreless PCB transformer and inductor are found to have favorable characteristics at high frequency operations. The maximum power conversion efficiency is 80% Even for high operating frequency an efficiency greater than 70% can be obtained with under 0.7% regulation error.

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A Novel BIRA Method with High Repair Efficiency and Small Hardware Overhead

  • Yang, Myung-Hoon;Cho, Hyung-Jun;Jeong, Woo-Sik;Kang, Sung-Ho
    • ETRI Journal
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    • 제31권3호
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    • pp.339-341
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    • 2009
  • Built-in redundancy analysis (BIRA) is widely used to enhance the yield of embedded memories. In this letter, a new BIRA method for both high repair efficiency and small hardware overhead is presented. The proposed method performs redundancy analysis operations using the spare mapping registers with a covered fault list. Experimental results demonstrate the superiority of the proposed method compared to previous works.

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